William b



UNITED STATES WILLIAM B. CARPENTER, OF NEWARK,

PATENT OFFICE.

NEW JERSEY, ASSIGNOR TO HIMSELF AND THE CELLULOID NOVELTY COMPANY, OFNEW YORK, N. Y.

WATER-PROOF PAPER.

SPECIFICATION formingpart of Letters Patent No. 253,840, dated February21, 1882.

Application filed May 24, 1881.

To all whom it may concern:

Be it known that I, WILLIAM B. CARPENTER, of Newark, in the county ofEssex and State of New Jersey, have invented a new and use- 5 fulImprovement in VVater-Proof Paper, of

which the following is a specification.

My invention relates to the manufacture of water-proof paper; and itconsists in the use of any ordinary paper-pulp preparedas known to theart, combined with suitable plastic water-proof material-such ascelluloid, lignoid, coroline, or like plastic water-proof materialeitheras single articles or as compounds of any of them, according to the kindof paper to be made, which will be colored, as desired.

In the manufacture of paper the water-proof material will not bedissolved, but be ground to apowder, either dry or in water, until it isof the fineness required for the particular paper 20 to be made. Thepaper-pulp and water-proof material willthen be ground, mixed togetherin water until they are thoroughly incorporated, forming a compoundpulp, to be made into paper by any well-known or suitable process andmachinery not needful here to detail. After the paper has been made andhas passed through the last of the heated rollers commonly used inpaper-making and has been left to dry, I may add two steps to thisprocess, according to the nature of the water-proof substance orsubstances used.

First. The paper may be put through a vapor-bath of alcohol or rapidlythrough a weak alcoholic bath when the waterproof material solved inalcohol.

(No specimens.)

used-such as celluloid-is capable of being dis- 3 5 The object of thebath is to partially dissolve on the surface any of the ma; terialswhich may not be well united by mixing and the action of the heatedrollers above named.

Second. Then after 7 the bath the paper is again passed through theheated rollers, when all the elements will be more thoroughly'inte'grated.

The proportion of the paper-pulp and of the 45 water-prootmaterial willbe regulated by the demand, aecording to the kind of paper to be made.

I claim- 1. A paper made from a combination of pa- 5o per-pulp and aplastic water-proof materialsuch as celluloid, lign oid, or similarplastic water-proof material-substantially as.specified. 4

2. The process of making a com pound paper- 5 5 pulp by mixing orgrinding in waterthe waterproof material and the ordinary paper-pulp,substantially as and for the purpose set forth. The process of puttingthe paper, when made from the compound pulp, as described, 60 throughthebath and afterward through the heated rollers, substantially as and forthe purpose named.

WILLIAM B. CARPENTER.

Witnesses:

HORACE HARRIS, S. R. STEADMAN.

